|Publication number||US6951606 B2|
|Application number||US 10/796,338|
|Publication date||Oct 4, 2005|
|Filing date||Mar 9, 2004|
|Priority date||Apr 26, 2001|
|Also published as||CA2444801A1, CA2444801C, EP1381441A1, EP1381441A4, US6736965, US20020158003, US20040168959, WO2002087726A1|
|Publication number||10796338, 796338, US 6951606 B2, US 6951606B2, US-B2-6951606, US6951606 B2, US6951606B2|
|Inventors||Jason M. Cousineau, David J. Allen|
|Original Assignee||Emp Advanced Development Llc|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (26), Referenced by (5), Classifications (34), Legal Events (9)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This application is a continuation of U.S. application Ser. No. 10/131,009 filed Apr. 24, 2002, now U.S. Pat. No. 6,736,965, which, in turn, claims the benefit of U.S. provisional application Ser. No. 60/286,767 filed Apr. 26, 2001.
1. Field of the Invention
The present invention relates to an auxiliary filtration system and a method of continuous filtration in engine applications.
2. Background Art
Current oil filtration systems for vehicle engines consist of a full flow filter in which 100% of the engine oil flow passes through the filter. The filter is designed to remove only the large particles from the oil because the filter must not restrict the oil flow. In turn, the filtering effectiveness is extremely limited. Current full flow filters are only efficient in controlling particles fifteen microns and larger. Ninety-five percent of the contamination generated within a vehicle engine is smaller then ten microns. This current filtration technology leads to short oil change intervals. Frequent oil changes are expensive, time consuming, and generate a tremendous amount of waste from the disposal of oil and oil filters. Most full flow filters are also equipped with a bypass valve. These filters have a tendency to clog before the service interval is up. When this happens, the bypass valve opens and unfiltered oil is circulated throughout the engine.
To add to the dilemma, increasingly stringent air emission regulations have dictated new engine designs employing the use of exhaust gas re-circulation (EGR) technology. EGR systems send a portion of the engine exhaust gas back to the combustion chamber in order to reduce NOx formation; however, EGR causes an increase in the amount of soot being deposited to the oil. Soot is a by-product of the combustion process and its primary component is carbon. These soot particles are very small; they are hard, abrasive and have a tendency to bind or stick together to form larger masses of soot. High soot levels in the engine oil will cause an increase in the oil viscosity, which then leads to higher operating temperatures. High soot levels will also result in the early depletion of the chemical additives in the oil which prevent oil deterioration. This leads to excessive engine wear and reduction in engine life. Finally, the large masses of soot can cause premature filter plugging. EGR provides a multi-pass opportunity for soot to enter the oil. Because of the new engine designs, especially the trend to use EGR in diesel engines, the oil is getting dirtier faster.
The industry's solution thus far has been the adaptation of bypass filter systems. The bypass filter system is typically installed in parallel to the full flow filter. The bypass filter continuously diverts a side stream of ten to fifteen percent of the engine oil flow, filters it more efficiently through the use of finer filtration, and then returns the oil back to the oil pan. The bypass filter works in conjunction with the full flow filter to capture particles and contamination that are missed by the full flow filter. When the full flow filters are run in parallel with the bypass filters, they have less work to do, thereby increasing the time between service intervals. However, the bypass filters do have limitations. Current bypass filters can capture particles in the range of five to twenty microns. This leaves many smaller and more abrasive particles suspended in the oil. One particularly harmful contaminant that remains unfiltered is soot. Soot particles are typically less than one micron in size and have a tendency to stick together or agglomerate over time. Soot agglomerates grow in size until they fall out of suspension and form sludge in the bottom of the oil pan. Because of the limited filtering capacity associated with the canister designs of current bypass filters, sludge causes premature clogging of both the full flow and bypass filters. With more soot being deposited in the oil due to EGR, this becomes an even greater concern. One final problem associated with bypass filter systems is the introduction of lube pressure parasitic losses. Because bypass systems divert approximately ten percent of an engine's total oil stream to the bypass filter, a lube pressure parasitic loss is introduced. In extreme conditions, diversion of this amount of oil can lead to starvation of necessary lubrication in certain engine components.
The use of a high efficiency bypass filtration system is not a complete answer to the problems that plague the industry. In order to extend oil and filter life, it is necessary to adopt a system that incorporates the advantages of a by-pass system with the ability to extend oil filtering capacity.
The present invention utilizes an auxiliary filtration system in conjunction with a continuous filtering method. The auxiliary filtration system operates totally independent of the main lubrication system of an engine and consists of a pump, a filtration device, and the appropriate hardware and fluid conductors. These components are installed as a separate sub-system of a vehicle engine's conventional lubrication system. The pump pumps the oil out of the oil pan, through the filtration device, and back to the oil pan in a continuous fashion. The pump flow is variable and relatively low to allow for the efficient removal of small particles. The auxiliary filtration unit is relatively easy to retrofit on existing engine systems and allows for extra oil capacity as well as off-line filtration. Oil cooling may also be incorporated into the system. The auxiliary filtration system can be used in the oil drain and fill process via the use of the pump, such as an electric oil pump, working in concert with the appropriate fluid conductors and valves or quick connect fluid conductors. During the oil drain, the oil will be pumped from the oil pan to an appropriate container. During the oil fill, the oil will be pumped from a container to the oil pan and can be sent through the filtration device to pre-filter the oil. The filtration system described herein may also be designed to be used as a replacement for the conventional full flow filter system.
The present invention utilizes an auxiliary filtration device to provide a continuous filtering method to the engine oil. This device consists of a replaceable/recyclable filtering media cartridge, a self-indexing system to continuously advance in clean filtering media, and a housing to enclose it all. The media cartridge contains filtering media, a supply reel and a take-up reel. It is also possible to design the auxiliary filtration system so that it does not contain a media cartridge. In this alternative embodiment, the filter media would be attached directly to the media reels in the filtration device housing.
The present invention applies a continuous filtering method to the engine oil. By using a reel-to-reel configuration, the filtration device is able to automatically replace used or dirty filtering media with clean filtering media in a controlled and continuous fashion. The invention provides an unlimited filtering capacity for contaminant retention over a set service interval. Because of this continuous method, the filtering operation will be unaffected by the high soot levels introduced from EGR. The reel-to-reel principle is based upon the monitoring of the pressure differential between the upstream side and the downstream side of the filtering media. When a high pressure differential exists, due to the build up of particles on the filtering media, signals will be sent to the pumping means to cease oil flow to the filter, and to the self-indexing system to advance clean filtering media from a supply reel. At the same time, the self-indexing system will eject the dirty filtering media to a take-up reel. The pumping means then initiates oil flow back through the filter device. This process is continued until a desired pressure differential is attained. When the desired service interval has been reached, the filtering media cartridge can be removed and replaced with a new cartridge.
The present invention utilizes high efficiency finer filtration to capture more soot and suspended particles than both the conventional full-flow and bypass filters. Additionally, since the auxiliary filter is filtering solid contaminants at a much finer level than the full flow filter, the full flow filter does not become prematurely clogged and its life is extended.
Electrostatic agglomeration can be incorporated into the invention to enhance the invention's ability to capture small, problematic contaminants such as soot. This could be accomplished by either placing an electrically charged wire mesh in front of the filtering media or fabricating it into the filtering media. The charged mesh would allow for the attraction and agglomeration of soot particles onto the mesh. Once the agglomerates reach a certain size, the oil flow will cause the agglomerates to break off and be collected by the filtering media. A second alternative method of soot collection utilizes a special chemical coating to enhance the filtering media and its ability to attract and collect soot particles.
The filtration device can also be designed to replenish the oil with additives. One means of accomplishing additive replenishment would be to monitor the quality of the oil, and when it is determined that replenishment is necessary, use an injector to spray additives onto the filtering media or apply a special additive chemical coating to the filtering media. In both cases, the additives would dissolve into the oil flow as it passes through the filter media. Another alternative method of additive replenishment would involve mounting a replaceable and recyclable additive releasing cartridge onto the return line. The additives would dissolve into the oil flow as it passes through the cartridge.
An alternative embodiment of the invention would be an auxiliary filtration system described herein that does not include a pump. Instead of using an auxiliary pump to pump the oil to and from the oil pan through the auxiliary filtration system, it would be possible to simply divert a side stream of oil from the standard engine lubrication system to the auxiliary filter. The auxiliary filter would be mounted in parallel with the full flow filter.
Accordingly, an object of the invention is to provide an improved engine oil filtration system which includes an auxiliary filter operatively connected to an engine oil pan for selectively filtering fine contaminants from the oil, wherein the auxiliary filter preferably consists of a replaceable/recyclable filtering media cartridge including a self-indexing system to continuously advance clean filtering medium as the filtering media becomes clogged.
The above object and other objects, features and advantages of the invention are readily apparent from the following detailed description of the best mode for carrying out the invention when taken in connection with the accompanying drawings.
Provided in the system 10 are means for remote draining 30 and filling 32. This can be accomplished by using directional control valves at location 30 and 32. Another option would be to incorporate quick connect couplings to the fluid conductors. This would allow for the interchanging of fluid conductors for the draining and filling process. For example, for the remote draining process, fluid conductor 24 could be removed and placed at location 30. An optional cooler 34 can be installed for cooling of the oil. An oil quality/level sensor 35 can be used to signal the electronic control module 22 when the engine oil needs replenishment. Integration of an oil make-up tank and additive make-up tank, would complete a total oil management system.
As seen in
As shown in
When voltage is applied to the solenoid 116, a magnetic field is created which draws in the solenoid armature 120. This in turn, through the linkage arm 118, rotates the drive arm 122 in a counter clockwise direction (as viewed in FIG. 10). The driving pawl 124 forces the ratchet wheel 126 to rotate in this direction as well. When the solenoid 116 has completed its stroke, the armature 120 returns to its original position via a return spring 130. A spring loaded locking pawl 132 prohibits the ratchet wheel 126 from reversing its direction as the drive arm 122 is also returned to its original position.
All of the index mechanism's components are mounted to a base plate 134, which mounts up into the bottom compartment 46 of the filtration device housing 36 (see FIG. 5). An alternative method of indexing involves the replacement of the linear solenoid, linkage arm, drive arm, drive pawl, locking pawl, ratchet wheel and the springs, with an electric rotary-type solenoid. A roller clutch, which allows free rolling in one direction and drives in the other direction, is coupled to the solenoid armature shaft and the index drive shaft. When voltage is applied to the rotary solenoid, the armature shaft rotates, driving the take-up reel shaft. When the armature has reached full stroke, a built in return spring forces the armature back to its original position. The roller clutch allows for the return with out driving the take-up reel shaft back as well. Another alternative method of indexing includes the replacement of the linear solenoid, linkage arm, drive arm, drive pawl, locking pawl, ratchet wheel and springs with an electronic stepper motor. The output shaft of the stepper motor would be coupled to the take up reel shaft. In each of the indexing methods, a gear train or a pulley/belt system can be incorporated to increase the torque output to the take-up reel shaft when necessary.
The tensioning device 136 can also be configured to have an additional cover 154 to house a standard position sensor. The cover 154 would be attached to the housing 138 with fasteners 156. This configuration would allow for diagnostic capabilities that could indicate filter media tearing or binding, as well as other system conditions. The position sensor would detect the rotary motion of the rotating member 146. If the rotating member 146 is not rotating during an index cycle it may indicate a tear or bind in the media.
An alternative tensioning device involves configuring the flange of the media supply reel 104 with the gear teeth.
Under normal operation, the electric oil pump 18 (see
Next, the index mechanism 114 (see
As an alternative, the amount of filtering media 54 advanced can simply be based on a predetermined amount, rather than a drop in the differential pressure. For example, the filtering media can be advanced such that all of the used media is transferred to the take-up reel 106—i.e., the media is advanced one full frame. Conversely, the media may be advanced less than one full frame, such that a portion of the oil passes through clean media, while another portion of the oil passes through used media. This method takes advantage of the particles previously deposited on the filtering media (the “filter cake”), to create an even finer filter for the oil. Of course, the flow rate of oil through the filter cake is less than the flow rate through clean media; however, the benefits of additional filtering and longer media life may make this an attractive option in some applications.
The amount of filtering media 54 being advanced can be determined by a number of methods. For example, one method is to control the rotation of the ratchet wheel 126, which is directly related to the amount of filtering media 54 being advanced. Similar methods can be used when the indexing system is configured with a rotary solenoid or a stepper motor. When an extended preventive maintenance interval for the engine has been reached, the filtration device access cover 42 is removed, and the filtering media 54, the media supply reel 104, and the take-up reel 106 are replaced. If the auxiliary oil filter is configured with a filtering media cartridge, such as 56 in
The operation of the auxiliary filtration device 26 is altered when configured with the inflatable seal 70 (see FIGS. 6 and 7). When oil initially enters the main passage 90, the valve 82 is closed and the valve 84 is opened. This allows the oil flow to enter passage 92, which in turn feeds the inflatable seal 70 via passage 172 and the inflatable seal stem 94. The oil pressure causes the seal 70 to inflate axially, forcing the filtering media 170 up against the media support 76 and the clamp ring 74. When the pressure sensor 86 senses that a predetermined seal pressure has been attained, the valve 82 opens, the valve 84 closes, and the oil flow is directed to passage 96. Passage 96 feeds the inlet cavity 66, thus allowing the filtration process to begin.
The inflatable seal 70 maintains a positive seal between the inlet and outlet cavities 66, 68 by trapping oil in the seal when valve 84 is closed. The seal pressure is monitored via the use of the pressure sensor 86, and if the seal pressure exceeds the predetermined pressure, the pressure relief device 88 opens to allow oil to enter passage 174 and bleed into the inlet cavity 66. As with other embodiments, once the predetermined pressure differential across the filtering media 170 is attained, the electronic oil pump ceases directing oil flow to the filtration device. The passage 92 is opened, thereby releasing the pressure and deflating the inflatable seal 70. The filtering media 170 is then advanced, and the process begins again with the inflation of the inflatable seal 70. Another alternative seal design involves the use of a flexible lip seal 176 (shown in phantom in
The present invention is a significant improvement over the current technology in lubrication system filtration for engine applications. Some of the major improvements include: (1) the use of an auxiliary filtration system, the operation of which is totally independent of the engine lubrication system, (2) a filtering method which applies continuous, finer filtration with unlimited filtering capacity, (3) the addition of a remote fill and drain to aid in servicing, (4) the opportunity to integrate problematic contaminant collection techniques as well as additive replenishment schemes and (5) the opportunity to integrate an oil level and quality sensor, an oil make-up scheme, and an oil cooler to complete a total oil management system.
The present invention also contemplates the use of such a filter having a removable media cartridge as a replacement of the conventional full flow filter. It is also contemplated that the invention could be used as a by-pass filter in parallel with the conventional filter, rather than being used with an independent pump. It is further contemplated that the replaceable aspect of the media cartridge could be eliminated and the filtering media reels would simply be stored in the filter housing permanently.
While the best modes for carrying out the invention have been described in detail, those familiar with the art to which this invention relates will recognize various alternative designs and embodiments for practicing the invention within the scope of the appended claims.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US794631||Jan 26, 1905||Jul 11, 1905||James S Milne||Filtering apparatus.|
|US2250672||Mar 15, 1939||Jul 29, 1941||Leonard O Keefer||Oil filter|
|US2675129||May 23, 1951||Apr 13, 1954||Sherwin Williams Co||Continuous filter|
|US2867324||Mar 12, 1956||Jan 6, 1959||Hirs Gene||Filter apparatus|
|US3368333||Aug 12, 1964||Feb 13, 1968||American Radiator & Standard||Advance mechanism for roll-type air filter|
|US4054521||Sep 22, 1975||Oct 18, 1977||Brunswick Corporation||Indexing mechanism|
|US4132485||Aug 11, 1975||Jan 2, 1979||Qume Corporation||Ink ribbon cartridge with constant tension mechanism|
|US4221576||Jan 19, 1979||Sep 9, 1980||James M. Perrier, Sr.||Automatic air filter changer|
|US4260917||Jul 13, 1978||Apr 7, 1981||The Superior Electric Company||Interconnection for the windings and lead wires of a motor|
|US4265748||May 8, 1980||May 5, 1981||Tecnocar S P A||Lubricant filter for internal combustion engines|
|US4390428||Nov 6, 1981||Jun 28, 1983||Bratten Jack R||Filtration apparatus|
|US4512299 *||Dec 12, 1983||Apr 23, 1985||International Harvester Company||Automotive engine with improved multifilter lubrication system|
|US4620917 *||Apr 10, 1985||Nov 4, 1986||Nippon Soken, Inc.||Electrostatic filtering device|
|US5307551||Feb 3, 1993||May 3, 1994||Bratten Jack R||Method of installing a filter belt on a filter housing mounted roller|
|US5624579||Sep 28, 1995||Apr 29, 1997||Bratten; Jack R.||Method of simultaneously indexing permanent and disposable filter media in a vacuum filter apparatus|
|US5683581||Nov 8, 1995||Nov 4, 1997||Sms Schloemann-Siemag Aktiengesellschaft||Belt-type filter apparatus for removing foreign particles from liquid baths|
|US5968354||May 15, 1997||Oct 19, 1999||Brinkley; Herman E.||Apparatus for recovering oil-based liquid|
|US6095343||Dec 23, 1998||Aug 1, 2000||Dooley, Jr.; John P.||Gravity liquid filtration apparatus|
|US6117339||Nov 3, 1999||Sep 12, 2000||Advanced Filtration Concepts||Sealing arrangement for filter belt|
|US6168646||Apr 2, 1999||Jan 2, 2001||Nortel Networks Limited||Flow rate control of temperature control fluids|
|US6174446||Mar 23, 1999||Jan 16, 2001||Erik J. Andresen||Vacuum filter apparatus and method for recovering contaminated liquid|
|US6736965 *||Apr 24, 2002||May 18, 2004||Engineered Machined Products, Inc.||Auxiliary filtration system and filtering method|
|EP0744286A2||Aug 8, 1995||Nov 27, 1996||Somar Corporation||Film applying method and apparatus for carrying out the same|
|EP1061251A2||Jun 8, 2000||Dec 20, 2000||Fleetguard, Inc.||Fuel filter including slow release additive|
|JPH08930A||Title not available|
|JPS6354960A||Title not available|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US8807111 *||Mar 13, 2013||Aug 19, 2014||Frank A. Hughes||Oil pump modification system|
|US9109478||Jan 30, 2015||Aug 18, 2015||Pareto Point Industries, Inc.||Method and apparatus for a parallel bypass filtration system for internal combustion engines and similar systems|
|US20050072553 *||Feb 25, 2004||Apr 7, 2005||Robert Tigner||Gen set with external oil filter and pump|
|US20050178734 *||Feb 12, 2004||Aug 18, 2005||Kilmer Michael C.||Filter for use in closed vessels allowing the use of filter media which can be renewed without opening the vessel, and method of using same|
|US20130263827 *||Mar 13, 2013||Oct 10, 2013||Frank A. Hughes||Oil pump modification system|
|U.S. Classification||210/104, 210/387, 210/97, 123/196.00A, 210/143, 204/665, 210/184, 210/167.02, 184/6.24, 210/198.1, 210/748.01|
|International Classification||F16N29/00, F16N39/06, B01D35/02, F16N7/38, B01D35/30, B01D29/09, F01M11/03, B01D33/04, F01M1/10, F01M11/04|
|Cooperative Classification||F01M11/03, F01M2011/0466, B01D33/04, B01D35/30, F01M1/10, B01D29/096, F01M2011/033, F01M2001/1057|
|European Classification||B01D33/04, B01D35/30, B01D29/09C, F01M1/10, F01M11/03|
|Apr 14, 2005||AS||Assignment|
Owner name: EMP ADVANCED DEVELOPMENT, LLC, MICHIGAN
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:ENGINEERED MACHINED PRODUCTS, INC.;REEL/FRAME:015896/0467
Effective date: 20050331
|May 9, 2005||AS||Assignment|
Owner name: GENERAL ELECTRIC CAPITAL CORPORATION, CONNECTICUT
Free format text: SECURITY AGREEMENT;ASSIGNOR:EMP ADVANCED DEVELOPMENT, LLC;REEL/FRAME:015980/0764
Effective date: 20050405
|Aug 3, 2007||AS||Assignment|
Owner name: PRUDENTIAL CAPITAL PARTNERS, L.P., AS COLLATERAL A
Free format text: SECURITY AGREEMENT;ASSIGNOR:EMP ADVANCED DEVELOPMENT, LLC;REEL/FRAME:019640/0790
Effective date: 20070615
|Aug 16, 2007||AS||Assignment|
Owner name: GENERAL ELECTRIC CAPITAL CORPORATION, CONNECTICUT
Free format text: SECURITY AGREEMENT;ASSIGNOR:EMP ADVANCED DEVELOPMENT, LLC;REEL/FRAME:019699/0847
Effective date: 20070615
|Dec 15, 2008||AS||Assignment|
Owner name: ABLECO FINANCE LLC, AS COLLATERAL AGENT, NEW YORK
Free format text: GRANT OF A SECURITY INTEREST;ASSIGNOR:EMP ADVANCED DEVELOPMENT, LLC;REEL/FRAME:021976/0719
Effective date: 20071220
|Apr 13, 2009||REMI||Maintenance fee reminder mailed|
|Oct 4, 2009||LAPS||Lapse for failure to pay maintenance fees|
|Nov 24, 2009||FP||Expired due to failure to pay maintenance fee|
Effective date: 20091004
|Jun 19, 2013||AS||Assignment|
Owner name: EMP ADVANCED DEVELOPMENT, LLC, MICHIGAN
Free format text: RELEASE BY SECURED PARTY;ASSIGNOR:PRUDENTIAL CAPITAL PARTNERS, L.P.;REEL/FRAME:030643/0388
Effective date: 20130614